This solution is biodegradable and safe on all bike surfaces including discs and pads. 

Simply apply Peaty's Loam Foam liberally to the entire bike, wait for 3 - 5 minutes (time for a coffee/beer) and blast off with clean water.

Stubborn dirt may need to be persuaded to vacate your valiant steed with a soft-bristled brush, then rinsed off with cold water.